Compact Printed-On-CD UHF RFID Tag Antennas 科技英文報告 Compact Printed-On-CD UHF RFID Tag Antennas 指導老師: 余英松 老師 學 生: 498L0090 施昶榆 498L0100 李彥勳 498L0101 吳向容 498L0105 陳昶宏 498L0106 高柏翔

catalogue I. Introduction II. Body III. Conclusion

I. Introduction

RFID工作原理 RFID Tag Antenna HF Micro Controller Host Computer Reader Data Energy RFID Tag

天線晶片的匹配理論 ， 根據 Friis free-space equation， 讀取距離 r 為 (a) Pt 為Reader所放射功率，Gt、Gr 分為 Reader放射與Tag接收天線的增益， Pth 為最小啟動晶片功率[5] 功率傳輸係數(PTC)為 ， 其中 為晶片阻抗， 為Tag 天線阻抗 (a) (b) 圖1天線與晶片阻抗與匹配圖[5]

Kinds of RFID (Read-only Chips) (write one time/Read many times) (With Read-Write Chips) (Passive Tag) (Semi-Passive Tag) (Active Tags)

RFID的優點 Overwrite Advantage of RFID Unnecessary Invisible to be Reading pace High High durability Large data Overwrite Long read range

RFID的缺點 Signal interference RFID Shortcoming of High cost Weakly Signal Read rate

可應用層面 悠遊卡[2]、門禁的管制[3]、國道eTag系統

II. Body

Experiment setup Printed-On-CD UHF RFID Goal : a UHF RFID that is diameter smaller then 33.5mm also avoid the influence from metallization. 3 main points : 1. Tag antenna design 2. Tag antenna EM simulation 3. Measured tag antenna performance

Tag antenna design

Tag antenna EM simulation Fig. 2. Calculated current densities on the meander-type tag antenna left. printed on dielectric substrate right. printed on the same tag on CD with metal

Measured tag antenna performance Fig. 4. Measured impedance of the meander-type tag antenna and IC chip impedance.

Measured tag antenna performance

III. Conclusion The rapid advances in technology, the development and progress of RFID technology is changing people's lifestyles, RFID not only bring people to quickly and convenient, but also declared the star of the wireless communications technology era has arrived, but the life of the application of RFID technology commodities worry is likely related to personal privacy issues, promotion of RFID applications and universality in the future, we also need to grasp the shortcuts and privacy tradeoff, widely used in various fields.

reference Andrey S. Andrenko, “Compact Printed-On-CD UHF RFID Tag Antennas”

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